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New Canid Remains from Dolores Formation, Late Pleistocene-Early Holocene, Uruguay

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New Canid Remains from Dolores Formation, Late Pleistocene-Early Holocene, Uruguay J Mammal Evol DOI 10.1007/s10914-017-9387-8 ORIGINAL PAPER New Canid Remains from Dolores Formation, late Pleistocene-early Holocene, Uruguay Aldo Manzuetti1 & Daniel Perea1 & Andrés Rinderknecht2 & Martín Ubilla1 # Springer Science+Business Media New York 2017 Abstract The fossil record of carnivorous mammals in Introduction Uruguay is scarce and fragmentary, but informative. In the present contribution, two new records of canids allocated in The fossil record of placental mammals with a carnivorous diet sediments of the Dolores Formation (late Pleistocene-early (Order Carnivora) in Uruguay is formed mostly by fragmentary Holocene) are described. These records, based on their and relatively scarce, but informative, remains that include skulls anatomical-comparative study and multivariate analysis, cor- and mandibles, isolated teeth, and a diversity of long bones. respond to two foxes: one of medium size, Cerdocyon thous, Particularly, the fossil record of canids includes few taxa, the late conforms to the first record of this taxon in the country, mean- Pleistocene Dusicyon avus Burmeister, 1866, Protocyon while the other one, of larger size, is referred to Dusicyon avus troglodytes Lund, 1838, and Lycalopex gymnocercus Fischer, and is the first fossil record of this animal in the south of the 1814, and the Holocene Canis Linnaeus, 1758 (Prevosti et al. territory and the second record in the whole country. Until 2009 and references therein), with variations in body size and now, the only carnivorous mammals registered in this forma- level of carnivory. tion were the hunters of large herbivores (Arctotherium sp. Most of the canid findings (Dusicyon, Protocyon,and and Smilodon populator). In this way, these discoveries com- Lycalopex) come from deposits allocated to the late plement and expand the set of placental mammals with a car- Pleistocene of the northern part of the country (Sopas nivorous diet for this unit, particularly with the capacity to Formation) (Ubilla 2004;Prevostietal.2009;Ubillaand predate over small- and medium-size mammals. Martínez 2016). However, these findings are rare in deposits of the southern part of the country. In the present contribution, two canids unearthed from sed- Keywords Dolores Formation . Uruguay . Dusicyon avus . iments attributable to late Pleistocene-early Holocene Cerdocyon thous (Dolores Formation) from the Department of Colonia (Beach of El Caño Creek) (Fig. 1) are described. This findings belong to two foxes, one of them is the first record of a big- sized fox (Dusicyon avus) for this geological unit, while the other corresponded to a medium-size fox (Cerdocyon thous Electronic supplementary material The online version of this article (doi:10.1007/s10914-017-9387-8) contains supplementary material, Linnaeus, 1766), which is the first record for the country. which is available to authorized users. * Aldo Manzuetti Geological Context [email protected] The Dolores Formation, mainly located in western and south- 1 Facultad de Ciencias (UdelaR), Iguá 4225, 11400 Montevideo, CP, ern Uruguay (Ubilla et al. 2011), is comprised of silty Uruguay claystones and siltstones, clay deposits, sandstones, and gravel 2 Museo Nacional de Historia Natural, 25 de Mayo 582, (mudstone). It is generally brownish in color, with gray-green 11000 Montevideo, CP, Uruguay local shades, and a maximum of 10 m thickness. It was J Mammal Evol (Prosthion-postorbital process); tooth row length I1-M2 (TRL I1-M2); tooth row length C-M2 (TRL C-M2); tooth row length M1–2(TRLM1–2); antero-posterior diameter and crown height of the canine (CAP and CCH); antero- posterior and transverse diameter, and crown height of the PM4 (PM4AP, PM4ML, and PM4CH, respectively); and antero-posterior diameter of the M1 (M1AP). Jaw and lower teeth measurements: antero-posterior diam- eter and crown height of the canine (cAP and cCH); crown height of the pm2 (pm2CH), antero-posterior diameter of the pm4 (pm4AP); antero-posterior and transverse diameter of the m1, m2, and m3 (m1AP and m1ML; m2AP and m2ML; m3AP and m3 ML, respectively); mandible height at the pos- Fig. 1 Map showing the zone of the discoveries (spot): Beach of El Caño terior border of the pm2 (Hpm2), the m1 (Hm1), and the m2 Creek, Department of Colonia (Hm2); mandible breadth at posterior border of the m1 (Bm1); and tooth row length m1–3(TRLm1–3). deposited in semi-arid and cold climatic conditions (Martínez The multivariate analysis (principal components analysis and Ubilla 2004 and references therein; Corona et al. 2013). (PCA) and hierarchical cluster) were performed on the Several numerical datings based on radiocarbon and OSL/TL variance-covariance matrix measurements, using the statisti- methods were obtained for the Dolores Formation, with ages cal program PAST Version 2.09 (Hammer et al. 2001). ranging from 30.100–27.000 to 11.150–10.480 years before The skull data of L. griseus, L. culpaeus,andsome present (BP) (Ubilla et al. 2011 and references therein). Based L. gymnocercus and the jaw data of D. avus, D. australis, on the mammalian assemblage, this unit is correlated with the and L. culpaeus came from the literature (Prevosti et al. Lujanian Stage/Age (Ubilla et al. 2011 and references therein). 2005, 2015). The information for C. thous and most Particularly for the studied area (Beach of El Caño Creek), L. gymnocercus were collected from specimens housed in recent works produced an OSL age of 16.070 +/− 930 years the Colección de Vertebrados de Facultad de Ciencias and at the base of the outcrop (Corona et al. 2013). the Museo Nacional de Historia Natural (Montevideo) (Online Resource 1). Data availability statement Materials and Methods The described fossil materials are housed in the fossil verte- Institutional Abbreviations brate collection of Facultad de Ciencias (FC-DPV), Montevideo, Uruguay. For the comparative analysis, recent FC-DPV, Facultad de Ciencias- Colección de Vertebrados materials of Lycalopex gymnocercus, Cerdocyon thous,and Fósiles, Montevideo, Uruguay; MNHN,MuseoNacionalde Chrysocyon brachyurus housed in the mastozoological col- Historia Natural, Montevideo, Uruguay; and ZVC-M, lections (ZVC-M and MNHN) of the referred institutions were Colección de Vertebrados de Facultad de Ciencias, Sección considered. The dataset of Cerdocyon thous and Lycalopex Mamíferos, Montevideo, Uruguay. gymnocercus generated or analyzed during this study are in- cluded in this published article (and its supplementary infor- For a comparative analysis, materials of Lycalopex mation files). The other datasets analyzed during the current gymnocercus, Cerdocyon thous,andChrysocyon brachyurus study are available from the corresponding author on reason- housed in the mastozoological collections of the Facultad de able request. Ciencias and the Museo Nacional de Historia Natural (Montevideo) were considered. All of the measurements were taken by one of us (A. M.) following von den Driesch (1976) and Prevosti et al. (2005, Results 2015), with digital calipers accurate to 0.01 mm and were expressed in millimeters. Carnivora Bowdich, 1821 Skull and upper teeth measurements: rostral width (RW, Canidae Fischer von Waldheim, 1817 taken from the external edge of the canine alveolus); inter- Dusicyon Hamilton Smith, 1839 orbital width (IOW); post-orbital process width (PPW); viscero-cranial length (Prosthion-Nasion); facial length Dusicyon avus (Burmeister, 1866) J Mammal Evol and because of tooth wear to the occlusal surface, it is very difficult to distinguish the cusp morphology in the m1 talonid and the m2, and it is deduced that it belonged to an old adult individual. Measurements, in mm.: H m1, 20.73; H m2, 20; B m1, 9, TRL m1–3, 33.34; m1 AP, 20.63, m1 ML, 7; m2 AP, 8.99, m2 ML, 6.01; and m3 AP, 4 y m3 ML, 3. Remarks: The PCA performed on m1AP, m1ML, m2AP, m2ML, and Hm1 measurements indicated the presence of five components, and the first two explained more than 95% of the variance of the sample (Online Resource 2). When plotting the values of these components, the fossil material grouped with Fig. 2 Mandible of Dusicyon avus (FC-DPV 2936) in right lateral and occlusal view. Scale 5 cm D. avus (Fig. 3). The loadings coefficients of the first compo- nent showed that the most influential variables were the Hm1 and m1AP; meanwhile, the others had scarce contributions Material referred: FC-DPV 2936: fragment of right man- (Online Resource 2). The cluster analysis concurred with dible, with m1, m2, and alveolus of m3 (Fig. 2). these results and grouped the fossil material with D. avus Locality and stratigraphic horizon: Beach of El Caño (Online Resource 2). Creek, near the city of Colonia del Sacramento (Department of Colonia, Uruguay). The material was found in situ in the Cerdocyon Hamilton Smith, 1839 ravine brownish sediment level that correspond to the late Pleistocene-early Holocene Dolores Formation. Cerdocyon thous Linnaeus, 1766 Anatomical description: The mandible is larger in absolute dimension than L. gymnocercus and C. thous, but not as much Material referred: FC-DPV 1885: almost complete anterior as C. brachyurus. The horizontal ramus is high; the masseteric region of skull and jaw, articulated (Fig. 4). fossa is deep and its anterior border reaches the posterior bor- Locality and stratigraphic horizon: Beach of El Caño der of the alveolus of m3; and the inferior border of the ramus Creek, near the city of Colonia del Sacramento (Department is curved downward. The m1 is anteroposteriorly longer of Colonia, Uruguay). Although the material was not found in than m2 and m3 at the alveolar level. It is broken along situ, it is possible confidently to assign it to the late Pleistocene- its trigonid, which is proportionally large in relationship early Holocene Dolores Formation because of the type of fos- to the talonid. The paraconid and the protoconid are not silization, which is very similar to other fossils collected in that well preserved; the metaconid is small. Additionally, unit from carbonatic levels (Online Resource 3).
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